運用田口方法改善無線網路卡功率測試機台誤判之研究

Abstract

摘要

提高生產良率來降低生產成本支出並且提昇產品品質，一直是產業界致力追求的目標。在生產製作過程中所產生的不良，可能源自於設計、製程、零件、測試、操作人員等因素所導致。而測試是確保產品品質的重要步驟，負責檢驗產品在測試之前所經過程的成果，測試結果的正確與否將影響對整個產品製作過程的評價。 無線網路卡是現今邁入無線網路世界之重要產品，廣泛被應用於筆記型電腦做為其與無線基地台間之連結。無線網路卡之傳輸功率為衡量其功能重要之品質特性，傳輸功率的測試由於涉及高頻訊號易受外在環境影響之敏感特性，加上其測試設備由多種裝置組成，因此常有誤判情形發生，為求準確衡量此一品質特性以改善誤判，本研究經由與設計、製程及生產工程人員討論找出影響功率測試結果之主要因子，應用田口玄一博士所發展的動態參數設計方法，得到無線網路卡功率測試設備組成之最佳配置，此最佳配置可降低因機台設定的差異所造成的誤判。 本文藉由新竹工業區某公司的實例說明本個案無線網路卡功率測試之改善情況，找出測試設備較佳組成，將功率測試不良所佔比率由60%降低至17%，有效地提高生產良率與降低成本。

ABSTRACT To reduce production cost and increase quality by improving production yield is always being the goal of industry. Failures in production process may come from design, process, component, test and operator. Test is critical step to guarantee product quality, which will judge the whole result before test. The accuracy of test result will firmly effect the evaluation of production process. Wireless network card is important in modern wireless world and has been extensively applied in laptop to connect wireless station. Transmission power is major quality characteristic of wireless network card. Due to sensitivity of radio frequency and the test equipment is composed of several devices, the transmission power is misjudged frequently. In order to measure this characteristic correctly, we discussed with engineering staff such as RD, PE, MFG engineer to find out main effective factors of testing during manufacturing process, and applied dynamic parameter design method developed by Dr. Genichi Taguchi to acquire optimal factor combination of testing equipment through experiment. We also determine optimal installation after confirmation experiment. The misjudgement from different installation and synchronizing test result is reduced. This study demonstrates a real case that applied Taguchi’s approach to improve power test of wireless network card by acquiring better composition of test equipment. The power related failure rate is reduced from 60% to 17%; thereby production yield is improved and cost is reduced.